<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col :span="2">
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template v-slot="scope">
            <!-- 通过-->
            <el-row :class="['bdbottom',index1 === 0 ? 'bdtop' : '','vcenter']"
                    v-for="(item1,index1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag @close="removeRightById(scope.row,item1.id)" closable>{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过 for 循环 渲染二级权限 -->
                <el-row :class="['bdbottom',index2 === 0 ? 'bdtop' : '','vcenter']"
                        v-for="(item2,index2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success" @close="removeRightById(scope.row,item2.id)" closable>
                      {{ item2.authName }}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <!-- 通过 for 循环 渲染三级权限 -->
                    <el-tag type="warning" v-for="(item3,index3) in item2.children" :key="item3.id"
                            @close="removeRightById(scope.row,item3.id)" closable>
                      {{ item3.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template v-slot="scope">
            <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
            <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
            <el-button type="warning" size="mini" icon="el-icon-setting"
                       @click="showSetRightDialog(scope.row)">分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all
               :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Roles",
  data() {
    return {
      // 所有角色列表数据
      roleList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 获取所有的权限数据
      rightsList: [],
      // 树形控件的属性绑定控件
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的数组值
      defKeys: [],
      // 当前即将分配权限的角色的id
      roleId: ''
    }
  },
  created() {
    this.getRoleList();
  },
  methods: {
    // 获取所有角色得列表
    async getRoleList() {
      const {data: res} = await this.$http.get('roles');
      console.log(res.data);
      if (res.meta.status != 200) return this.$message.error('获取角色失败');
      this.roleList = res.data;
      // console.log(this.roleList);
    },
    // 根据Id删除对应权限
    async removeRightById(role, rightId) {
      // 弹窗提示用户是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err);

      if (confirmResult !== 'confirm') return this.$message.info('取消删除');

      const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`);
      if (res.meta.status !== 200) return this.$message.error('删除权限失败');
      // 重新将刷新更新后的数据加入数据，可以解决页面关闭下拉框的问题
      role.children = res.data;
    },
    // 显示分配权限的对话框
    async showSetRightDialog(role) {
      // 当前即将分配权限的角色的id
      this.roleId = role.id;
      // 获取所有权限数据
      const {data: res} = await this.$http.get('rights/tree');
      if (res.meta.status !== 200) return this.$message.error('获取权限数据失败');
      // 把获取到的数据保存到 rightsList 中
      this.rightsList = res.data;
      // 获取最高级的父级节点的数据 role
      this.getLeafKeys(role, this.defKeys);
      this.setRightDialogVisible = true;
    },
    // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
    getLeafKeys(node, arr) {
      // 如果当前 node 节点不包含children 属性，则是三级节点
      if (!node.children) return arr.push(node.id);
      // 如果前面判断不通过，自调用当前的函数
      node.children.forEach(item => this.getLeafKeys(item, arr));
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = [];
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // console.log(keys);
      // 必须使用【 , 】拼接id，否则数据发送失败
      const idStr = keys.join(',');
      console.log(this.roleId);
      const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr});
      if (res.meta.status !== 200) return this.$message.error('分派权限失败');
      this.$message.success('分配权限成功');
      this.getRoleList();
      this.setRightDialogVisible = false;
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 15px 15px;
}

.bdtop {
  border-top: 1px solid #eeeeee;
}

.bdbottom {
  border-bottom: 1px solid #eeeeee;
}

// 设置表格内部显示的tag标签行内居中
.vcenter {
  display: flex;
  align-items: center;
}
</style>
